3x(2x-4)=6-3(7x+9)

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Solution for 3x(2x-4)=6-3(7x+9) equation:


Simplifying
3x(2x + -4) = 6 + -3(7x + 9)

Reorder the terms:
3x(-4 + 2x) = 6 + -3(7x + 9)
(-4 * 3x + 2x * 3x) = 6 + -3(7x + 9)
(-12x + 6x2) = 6 + -3(7x + 9)

Reorder the terms:
-12x + 6x2 = 6 + -3(9 + 7x)
-12x + 6x2 = 6 + (9 * -3 + 7x * -3)
-12x + 6x2 = 6 + (-27 + -21x)

Combine like terms: 6 + -27 = -21
-12x + 6x2 = -21 + -21x

Solving
-12x + 6x2 = -21 + -21x

Solving for variable 'x'.

Reorder the terms:
21 + -12x + 21x + 6x2 = -21 + -21x + 21 + 21x

Combine like terms: -12x + 21x = 9x
21 + 9x + 6x2 = -21 + -21x + 21 + 21x

Reorder the terms:
21 + 9x + 6x2 = -21 + 21 + -21x + 21x

Combine like terms: -21 + 21 = 0
21 + 9x + 6x2 = 0 + -21x + 21x
21 + 9x + 6x2 = -21x + 21x

Combine like terms: -21x + 21x = 0
21 + 9x + 6x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(7 + 3x + 2x2) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(7 + 3x + 2x2)' equal to zero and attempt to solve: Simplifying 7 + 3x + 2x2 = 0 Solving 7 + 3x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 3.5 + 1.5x + x2 = 0 Move the constant term to the right: Add '-3.5' to each side of the equation. 3.5 + 1.5x + -3.5 + x2 = 0 + -3.5 Reorder the terms: 3.5 + -3.5 + 1.5x + x2 = 0 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + 1.5x + x2 = 0 + -3.5 1.5x + x2 = 0 + -3.5 Combine like terms: 0 + -3.5 = -3.5 1.5x + x2 = -3.5 The x term is 1.5x. Take half its coefficient (0.75). Square it (0.5625) and add it to both sides. Add '0.5625' to each side of the equation. 1.5x + 0.5625 + x2 = -3.5 + 0.5625 Reorder the terms: 0.5625 + 1.5x + x2 = -3.5 + 0.5625 Combine like terms: -3.5 + 0.5625 = -2.9375 0.5625 + 1.5x + x2 = -2.9375 Factor a perfect square on the left side: (x + 0.75)(x + 0.75) = -2.9375 Can't calculate square root of the right side. The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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